Cold Sores and Canker Sores are the most common causes of sores on roof of mouth. Sore roof of mouth causes a great deal of pain and discomfort. Such sores are usually not considered contagious when caused by Canker Sores.
In order to determine if higher minimum wage leads to a higher unemployment two economic professors at Princeton University (David Card and Alan Krueger) conducted a study on minimum wage hikes with a focus on the New Jersey minimum wage hike in 1990. Card and Krueger compared unemployment and wages in New Jersey and Pennsylvania.
According to the theory, when unemployment rises, the wages of those workers that remain employed tend to stay the same or grow at a slower rate than before rather than falling with the decrease in demand for labor.